CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Wentao Zhang,Yukun Li,Li Wang,Fei Zhang,Yinyin Ai,Guosheng Shao,Peng Zhang
For the transformation of the global energy structure, photocatalyst-based artificial photosynthesis for solar-to-chemical energy conversion has been regarded as promising. Herein, we report the homogenous construction of cyano-modified g-C 3 N 4 ultrathin nanolayers onto SrTiO 3 nanotubes using a simple one-step gas–solid reaction, as well as their application to photocatalytic H 2 evolution and CO 2 reduction. The creation of one-dimensional core–shell nanostructures and type II heterojunctions broaden visible light absorption range and shorten charge transfer path. The electron-absorbing cyano introduced in situ without any auxiliary salts can not only provide an appropriate driving force for electron transport and extend the active site of photocatalytic reaction, but also alter the band gap to accomplish energy band alignment. Moreover, in-situ irradiation X-ray photoelectron spectroscopy (ISI-XPS) was used to confirm the dual active site system consisting of cyano and SrTiO 3 . This work aims to promote the development of the surface modification of core-shell nanostructured photocatalysts.
研究领域:
材料科学
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能源化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shan Gao,Haidong Yu,Yuewen Zhang,Hongan Ma,Xiaopeng Jia
Thermoelectrics (TE) have received a lot of attention for their ability to directly convert heat into electricity. This capability provides a promising solution for waste heat recovery and clean energy utilization. Strontium titanate (SrTiO 3 ) is a promising N-type oxide TE material. However, its practical application is limited by low electrical conductivity and high thermal conductivity. Here, we present a high-pressure synthesis technique aimed at simultaneously introducing defects as well as enhancing phonon scattering. Enhancing the thermoelectric properties of strontium titanate thermoelectric materials. SrTiO 3 samples doped with different concentrations of La were synthesized by high-pressure high-temperature (HPHT) synthesis, which effectively promotes the solid-phase reaction and thus allows for a more homogeneous and efficient doping of La atoms into the SrTiO 3 lattice as compared to the conventional synthesis method. The introduction of La 3+ creates a charge imbalance, which is compensated by the formation of oxygen vacancies. These oxygen vacancies act as donor defects, which in turn increase the carrier concentration and significantly improve the electrical conductivity of the samples. At the same time, the HPHT synthesis conditions induced severe lattice distortions, leading to grain refinement and the formation of dislocation networks and nanopores. By modulating the density and distribution of multiscale defects, La doping significantly improves the interfacial phonon scattering efficiency. This condition reduces the thermal conductivity and improves the thermoelectric properties. By combining defect engineering and interfacial phonon scattering, we achieved the decoupling of electrical and thermal transport properties in La-doped SrTiO 3 . Consequently, the thermoelectric figure of merit ( zT ) was significantly enhanced, reaching 0.18 at 973 K. This study introduces a new methodology and theoretical foundation for the development of high-performance oxide TE materials.
研究领域:
材料科学
·
热电材料
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Kunjuan Shao,Yanjie Wang,Muzaffar Iqbal,Lin Lin,Kai Wang,Xuehua Zhang,Meng He,Tao He
Modification of a wide-bandgap semiconductor with noble metals that can exhibit surface plasmon effect is an effective approach to make it responsive to the visible light . In this work, a series of cubic and all-edge-truncated SrTiO 3 with and without thermal pretreatment in air are modified by Ag nanoparticles via photodeposition method. The crystal structure, morphology, loading amount of Ag nanoparticles, and optical properties of the obtained Ag-SrTiO 3 nanomaterials are well characterized by powder X-ray diffraction, scanning microscope, transmission electron microscope, energy disperse X-ray spectroscopy, ICP-MS and UV–vis diffuse-reflection spectroscopy. The loading amount and size of the Ag nanoparticles can be controlled to some extent by tuning the photodeposition time via growth-dissolution mechanism. The Ag nanoparticles are inclined to deposit on different locations on the surface of cubic and truncated SrTiO 3 with and without thermal pretreatment. The resultant SrTiO 3 modified by Ag nanoparticles exhibits visible light activity for photocatalytic reduction of CO 2 , which is closely related to the oxygen vacancy induced by thermal pretreatment, size and amount of Ag nanoparticles. Accordingly, there is an optimized photodeposition time for the synthesis of the photocatalyst that exhibits the highest photocatalytic activity.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Zhiqiang Zhang,Ruijie Chen,Lei Wang,Xueru Chen,Jing Ding,Jinfeng Zhang,Hui Wan,Guofeng Guan
Photocatalytic reduction of CO 2 to methanol over SrTiO 3 (ST) perovskite oxide is considered as a promising method to alleviate environment and energy problems at the same time. Meanwhile, the inducing of Cu plays an important role in photocatalytic activity and selectivity. Herein, a series of SrTi 1-x Cu x O 3 -H 2 (STCu x -H, x = 0.04, 0.06, 0.08, and 0.1) nanofiber catalysts were prepared by electrospinning combined with in-situ dissolution strategy. Cu x O dissolved in situ on a one-dimensional nanofiber structure could realize more active sites exposed and convenient directional movement of electrons, simultaneously. The unique structure facilitates the enhancement of photocatalytic activity and the improvement of selectivity. The methanol yield of STCu 0.08 -H nanofiber catalyst upped to 5.38 ± 0.19 μmol·g −1 ·h −1 , which was twice that of ST. Moreover, the photocatalytic activity did not decrease significantly after four times of reuse. The characterization further demonstrated that STCu 0.08 -H had stronger light response ability and faster electron transfer ability than ST under the synergistic action of Cu 2+ and Cu + . STCu 0.08 -H had superior CO 2 adsorption, activation ability, and electronic reduction capability by DFT calculation. This study provided a new idea about the design of perovskite oxide nanofiber for photocatalytic CO 2 reduction.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Advanced Dielectrics
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2019
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IF 0
Bing Xie,Ling Zhang,Mohsin Ali Marwat,Yiwei Zhu,Weigang Ma,Pengyuan Fan,Haibo Zhang
The development of advanced dielectric film materials with high energy storage performance is of critical significance for pulsed power capacitor applications. Nevertheless, the low discharged energy density ( U e ) of current dielectric film material restricts their further application. In this work, core-shell structured SrTiO 3 @SiO 2 nanowires (ST@SiO 2 NWs) fillers are fabricated based on interface engineering for high U e . The optimized SiO 2 insulating layer could effectively confine the mobility of space charge carriers in the interfacial zone between ST NWs and thick SiO 2 insulating layer, thus reducing the interfacial polarization between the interface of nanofillers/polymer, which could be used to optimize the electric field strength and electric displacement of the corresponding nanocomposite. As a result, this nanocomposite film simultaneously exhibits enhanced maximum applied electric field ( E max ) and ( D max - P r ) values, thus releasing an ultrahigh discharged energy density of 14.7 J/cm 3 at 390 MV/m, which is 99% higher than that of the conventional ST/P(VDF-CTFE) (without SiO 2 coating) nanocomposite, and it is almost 2.5 times that of pure P(VDF-CTFE). This work demonstrates the superiority of the core-shell structured paraelectric nanowire in enhancing the energy storage performance of dielectric film capacitors, which is expected to guide the design of advanced energy-storage nanocomposites.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 7
·3935-3943
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IF 7.443
Dongfang Hou,Xianluo Hu,Wingkei Ho,Pei Hu,Yunhui Huang
Novel porous Cr-doped SrTiO3 nanotubes were fabricated using a simple and economical electrospinning technique with subsequent calcination. The average outer diameter of the nanotube was approximately 100 nm, and the multimodal porous netlike framework with high specific surface area was favorable for light harvesting and matter diffusion. Photocatalytic activity was evaluated by degradation of azo dye acid orange 7 and removal of NO under visible light irradiation. The enhanced photocatalytic activity of porous Cr-doped SrTiO3 nanotubes was attributed to the one-dimensional tube-like architecture, high specific surface area, multimodal pore size distribution, and proper Cr doping.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2014
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IF 2.2
Zhenlong Zhang,Jichun Zhu,Shengjun Li,Yanli Mao
SrTiO 3 /Bi 2 O 3 heterojunction semiconductor was prepared and characterized by X-ray diffraction, UV–vis absorption spectrum , and scanning electron microscope, surface photovoltage spectroscopy, and photoluminescence spectroscopy. The surface photovoltage spectra indicate that the separation efficiency of photoinduced charges for SrTiO 3 /Bi 2 O 3 was enhanced compared with that of SrTiO 3 or Bi 2 O 3 . The energy band diagram of SrTiO 3 /Bi 2 O 3 heterojunction was directly determined with X-ray photoelectron spectroscopy, and the conduction band offset between SrTiO 3 and Bi 2 O 3 was quantified to be 0.28±0.03 eV. The photoluminescence spectra display that the recombination rate of photoinduced carriers for SrTiO 3 /Bi 2 O 3 decreases compared with that of SrTiO 3 or Bi 2 O 3 , which is mainly due to the energy levels matching between them. Therefore the enhanced separation efficiency of photoinduced charges is resulting from the energy difference between the conduction band edges of SrTiO 3 and Bi 2 O 3 .
研究领域:
材料科学
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光催化
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 8
·1805-1812
·
IF 4.034
Jingmiao Peng,Ying Zhou,Hao Wang,Haoran Zhou,Shiyi Cai
Strontium titanate (SrTiO3) nanocrystals have been synthesized by a hydrothermal reaction route using anatase TiO2 nanosheets with dominant {001} facets and commercial anatase TiO2 nanoparticles as precursors. Time-resolved quenching experiments showed that the speed of hydrothermal formation of SrTiO3 was relatively fast (in minutes). The initial particle morphology and exposed crystal facets of anatase TiO2 precursor cannot be retained in the final SrTiO3 products. SrTiO3 nuclei are formed by the reaction between Ti(OH)x4−x and Sr ions at the TiO2 solid/liquid interface. As surface adsorbed F− is necessary to stabilize the {001} facets of anatase TiO2, the hydrothermal crystallization of SrTiO3 from TiO2 with {001} facets not only exhibits a slower reaction rate but also a higher activation energy. Moreover, the photoelectrochemical and photocatalytic activity studies indicated that the SrTiO3 products obtained from TiO2 with {001} facets showed enhanced photocurrent density and photocatalytic hydrogen production activity. The present study sheds some light on the understanding of the crystal facets of the precursor on the hydrothermal formation process as well as the photocatalytic activities of the corresponding products.
研究领域:
材料科学
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纳米技术
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光催化
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无机化学
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能源材料
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2014
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IF 2.93
Weirong Zhao,Zhuyu Ai,Xi Zhu,Meng Zhang,Qiaomeng Shi,Jiusong Dai
(AgNbO 3 ) 1− x (SrTiO 3 ) x samples were successfully employed as photocatalysts for photocatalytic hydrogen evolution under visible light. The samples were characterized by a series of techniques, including X-ray diffractometry, scanning electron microscopy, UV–Vis spectrophotometry , and electrochemistry technology. The band gaps of (AgNbO 3 ) 1− x (SrTiO 3 ) x solid solutions can be tuned continuously from 3.21 to 2.65 eV and the flat-band potentials ( V fb ) can be shifted positively from −0.79 to −0.31 V vs. SHE when x decreased from 1 to 0. Band positions of (AgNbO 3 ) 1− x (SrTiO 3 ) x samples were further testified by density functional theory, suggesting that the band gap narrowing of the solid solutions derived from the hybridization of (Ti 3d and Nb 4d) and (O 2p and Ag 4d) orbital. The photocatalytic activities of samples for H 2 evolution with Pt cocatalyst were evaluated in aqueous methanol solution under visible light irradiation . The highest photocatalytic activity was obtained at (AgNbO 3 ) 0.25 (SrTiO 3 ) 0.75 . Photocatalytic activity in hydrogen evolution of these solid solutions proved to be closely dependent on band structures .
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Congcong Piao,Yitong Lin,Zhiyu Liu,Liang Chen,Jianhe Tang,Dawei Fang,Jun Wang
ABSTRACT Several novel Z-scheme CuPd/SrTiO 3 –CuPd–Bi 2 O 3 photocatalysts are prepared via chemical reduction and calcination methods to degrade organic dyes containing N and S and convert NO 2 - , NO 3 - and SO 3 2- into (NH 4 ) 2 SO 4 . Sodium borohydride (NaBH 4 ), ascorbic acid (C 6 H 8 O 6 ) and hydrazine hydrate (N 2 H 4 ·H 2 O) are selected as reductants to deposit CuPd alloy nanoparticles on corresponding photocatalyst. The influence of solar light irradiation time on photocatalytic degradation of organic dye and conversion of the generated inorganic ions is studied. The reusability and stability of the prepared photocatalysts are assessed. The results indicate that the Z-scheme CuPd/SrTiO 3 –CuPd–Bi 2 O 3 photocatalyst prepared by using NaBH 4 has best photocatalytic activity, reusability and stability. The capture experiment of active species proves that holes play crucial roles in photocatalytic degradation of organic dyes and conversion of SO 3 2- and electrons are momentous for the conversions of NO 2 - and NO 3 - . A possible mechanism on photocatalytic degradation of organic dyes containing N and S and conversions of NO 2 - , NO 3 - and SO 3 2- into (NH 4 ) 2 SO 4 caused by Z-scheme CuPd/SrTiO 3 –CuPd–Bi 2 O 3 photocatalyst is proposed.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Chunli Diao,Hanxing Liu,Hua Hao,Minghe Cao,Zhonghua Yao,Haiwu Zheng
SrTiO 3 /BaTiO 3 (ST/BT) thin-film heterostructure was deposited on Pt/Ti/SiO 2 /Si(100) substrate by spin-coating. X-ray diffraction pattern shows that the heterostructure is a perovskite structure composed of ST and BT without any impurity peaks. The dielectric constant and loss of the heterostructure at 10 kHz are 704 and 0.024, respectively. The electric-field dependence of dielectric response was investigated and the tunability of the sample under 200 kV/cm applied field is 21.5%. Compared with pure ST thin film , the polarization-electric field loops of ST/BT heterostructure display high polarization and good symmetry, which could be attributed to the introduction of BT with high dielectric constant and inhibition of the potential pitfalls movement for high barrier at ST/BT interface. Moreover, the heterostructure demonstrates photoconductivity behavior with 405 nm light illumination. The results indicate that ST/BT heterostructure is a potential material in application as multifunctional photoelectric devices.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 43
·33938-33945
·
IF 3.84
Chunbo Liu,Ping Li,Guoling Wu,Bifu Luo,Shuang Lin,Ao Ren,Weidong Shi
In our study, a new visible-light-driven photocatalyst Cu2O/SrTiO3 (C/S) heterojunction was firstly prepared by a simple, facile and effective deposition–precipitation technique. The particle size of the Cu2O nanoparticle is only about 5 nm and the SrTiO3 (STO) nanocube is about 50 nm when modified by Cu2O nanoparticles. The samples are used as photocatalysts for photodegrading tetracycline (TC) under visible light irradiation. The 9-Cu2O/SrTiO3 (9-C/S) sample heterojunction shows the highest TC degradation ratio (77.65%), which is caused by the photogenerated electrons of the Cu2O nanoparticles moving from the conduction band of Cu2O to that of SrTiO3, resulting in the separation of electrons and holes. This study not only shows a possibility for substituting noble metals with low-cost Cu2O nanoparticles in photocatalytic degradation but also exhibits a facile deposition–precipitation technique for synthesizing narrow/wide band gap photocatalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
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